懵逼， controller 中两个接口调用 service 同一方法，方法中有递归操作，前端一个页面异步调用这两个接口，后端出现线程问题

cantroller 层 @PostMapping("/traffic/records") public List listTrafficRecord() { List doorRecordInfoVOList = doorApiService.doorRecordList(null); return doorRecordInfoVOList.stream() .limit(3) .collect(Collectors.toList());

} 

@GetMapping("/visitor/record") public List listVisitorRecord() { List doorRecordInfoVOList = doorApiService.doorRecordList("4"); return doorRecordInfoVOList.stream() .limit(2) .collect(Collectors.toList()); } service 实现

public List<DoorRecordInfoVO> doorRecordList(String typeFlag) { reentrantLock.lock(); try { //首先获取 token String token = this.getToken(); if (StrUtil.isEmpty(token)) { return null; } List<DoorRecordInfoVO> doorRecordInfoVOList = new ArrayList<>(); LocalDateTime now = LocalDateTime.now(); LocalDateTime start = now.minusHours(12L); return handleList(doorRecordInfoVOList, now, start, token, typeFlag, 0); }finally { reentrantLock.unlock(); } } private List<DoorRecordInfoVO> handleList(List<DoorRecordInfoVO> doorRecordInfoVOList, LocalDateTime now, LocalDateTime start, String token, String typeFlag, int retryCount) { //判断两个时间是不是在同一天 if (now.toLocalDate().equals(start.toLocalDate())) { //在同一天组装时间范围 String date = now.format(DateTimeFormatter.ofPattern("yyyyMMdd")); String startTime = start.format(DateTimeFormatter.ofPattern("HHmmss")); String endTime = now.format(DateTimeFormatter.ofPattern("HHmmss")); JSONArray recordArray = this.apiResult(token, date, startTime, endTime); this.addArrayToList(recordArray, doorRecordInfoVOList, typeFlag); } else { //不在同一天 String date = now.format(DateTimeFormatter.ofPattern("yyyyMMdd")); String endTime = now.format(DateTimeFormatter.ofPattern("HHmmss")); JSONArray recordArray1 = this.apiResult(token, date, "000000", endTime); this.addArrayToList(recordArray1, doorRecordInfoVOList, typeFlag); //加上前一天时间段 String preDate = start.format(DateTimeFormatter.ofPattern("yyyyMMdd")); String startTime = start.format(DateTimeFormatter.ofPattern("HHmmss")); JSONArray recordArray2 = this.apiResult(token, preDate, startTime, "235959"); this.addArrayToList(recordArray2, doorRecordInfoVOList, typeFlag); } if (doorRecordInfoVOList.size() < 3) { now = start; start = start.minusHours(1L); handleList(doorRecordInfoVOList, now, start, token, typeFlag, retryCount + 1); } return doorRecordInfoVOList; } private void addArrayToList(JSONArray array, List<DoorRecordInfoVO> doorRecordInfoVOList, String typeFlag) { if (ObjectUtil.isEmpty(array)) return; for (int i = 0; i < array.size(); i++) { JSONObject record = array.getJSONObject(i); DoorRecordInfoVO doorRecordInfoVO = new DoorRecordInfoVO(); String type = record.getStr("recogResult"); doorRecordInfoVO.setUserName(record.getStr("userName")); doorRecordInfoVO.setDoorName(record.getStr("doorName")); doorRecordInfoVO.setOpenTime( HcDateUtil.dateFormat(record.getStr("openTime"), "yyyyMMddHHmmss", "yyyy-MM-dd HH:mm:ss") ); doorRecordInfoVO.setRecordType(type); if (StrUtil.isNotEmpty(typeFlag) && typeFlag.equals(type)) { doorRecordInfoVOList.add(doorRecordInfoVO); } else if (StrUtil.isEmpty(typeFlag)) { doorRecordInfoVOList.add(doorRecordInfoVO); } } } private JSONArray apiResult(String token, String date, String startTime, String endTime) { JSONArray jsOnArray= null; //组装请求参数 Map<String, Object> requestMap = new HashMap<>(); Map<String, Object> map = new HashMap<>(); map.put("beginTime", startTime); map.put("endTime", endTime); map.put("date", date); requestMap.put("data", map); //调用 api 获取数据 String body = HttpRequest .post(getDoorRecordInfoUrl) .header("token", token) .header("appId", appId) .header("Content-Type", "application/json") .body(JSONUtil.toJsonStr(requestMap)) .execute() .body(); JSONObject resultJson = JSONUtil.parseObj(body); Integer code = resultJson.getInt("code"); if (code == 200) { JSONObject data = resultJson.getJSONObject("data"); jsOnArray= data.getJSONArray("data"); } return jsonArray; } 

上述实现如果我不加上 reentrantLock ，doorRecordInfoVOList 线程安全问题，有一个接口直接返回空了，但是直接分开调用，都有返回，请问这个为啥会有线程安全问题，求大佬指教